Some years back I did a thread on Whatifmodelers trying to describe permutations of the RAF
in the 60s onward. The various designs you mention would have been procured in place of analogue
aircraft over the same period.
The RAF squadrons with Lightnings, Canberras and Hunters offer some excellent squadron markings. It is likely that the Hawker designs would have worn similar schemes depending on the aircraft thye replaced and the period. Broadly, between 1960 and 1972 aircraft have the standard green-grey camo with silver or white undersides, or plain all metal finish in the case of the Lightnings. From the 70s to the 80s, wrap over green-grey in matt with red-blue roundels are standard. Squadron markings get smaller and more restrained, except for show aircraft.
The Whatifmodelers site has an excellent Profile and CGI thread section which covers practically every air force and aircraft and period. There are some really good artists there as wellas some experts on counterfactual air power.
Armament is harder. British aircraft tend to suffer from the bells and whistles factor. On the drawing board they are fitted with all sorts of improbable weapons. In service they have tended to be equipped with a few affordable and well tried weapons, notably AIM 9 Sidewinders. Apart from the Firestreak/Red Top family and the later Skyflash version of the Sparrow British weapons in this period are pretty duff (Blue Steel (Rascal copy) Martel (French missile anyway) and so on). Drawing board British weapons are of course legion and well covered in the Secret Projects books. However, most of these missiles look as if they were drawn for the pages of Dan Dare!
Other country users. Here one tends to get into fantasy rather than what-if. It is best to stick to the countries that actually did buy British (Middle East users (Saudi, Kuwait, Jordan, Oman) Latin America (Argentina, Chile, Peru) and some NATO (Belgium, Netherlands, Denmark and possibly Germany
(though the influence of the US in this period makes any British buy very unlikely after 1961).
Hope this helps
UK 75